Road-making.



W6. CDMPOSlllONS,

comma R Pursue Cross Reference Examiner UNITED STATES PATENT OFFICE.

JOHN COPE BUTIERFIELD, OF LONDON, ENGLAND. ROAD-MAKING.

Specification of Letters Patent. Application filed July 18, 1905. Birill F0- 270.295.

Patented Dec. 26, 190:.

To all w/mm it may concern:

Be it known that I, FIELD, a subject Joins Corn Burmaof the Kingof Great Britain foot-paths, pavements, and the like.

The object of the invention is to produce a good wearing and practically dustless and waterproof road to be ma de up at a small cost,

using in the construction thereof any local material which may be obtainable.

The invention consists in making up roads from any suitable hard materials-of appro-- priate size, cemented together by a cement made up from finely-divided lime or other shall form a cement-lik material capable of forming a soluble silicate which on exposure practically into. the air e material capable of indurating and binding together the bodies forming the road mixture into a hard concrete =5 mass.

3 and sugar or the like.

lime with a solution contamingsodium silicate 1n carrying my invention into effect Ttake any local material available-for example. revel, ballast. limestone, slakcd lime, chalk,

sani granite, slag. ort same by the e h 'ean crush the use of a crusher, separating the larger coarse material from the finer by means of a revolving sieve. material to form the w road, while the The former I use as a caring-surface of the latter, after admixture with 40 from ten to fifty per cent. of powdered limestone orchallntheproportion depending upon ie composli-ion and nature of the material in use, is mixed with a silica solution in such proportions \vetted to just cohere together and is then spread to adepth of about.

foundation of the road.

5 powder is sufficiently three inches upon the aand sugar that the rod?- The larger pieces of rock, which are to form a wearing-surface, are upon the plasticmass an then distributed evenly d rolled in by asteambe broken up and ground roller, so that the finer damp material is forced into the hollows existing between the larger stones, holding the same in amatrix, which in ashort time becomes hard, forming one concrete mass.

The solution above mentioned is made by taking silicate of soda to strength of from 25 to 40 wa e an adding to it from one to five per cent. of so r or molasses and is employed asabove escribed. In some cases it 69 is advisable to employ pitch and as halt in addition to the limestonmalk an t is solution above escri e Wu thisis the case, the asphalt mixture is made up as follows: The pitch or asphalt is reduced to powder, 5 either by grinding or by a disintegrator, and mixed with seventy toeighty per cent. of limestone, or mixture of-limestone with fine ranol asite is added to the requisite quantity pFialt-eay from fifteen to twenty per cent. of 7 the whole mass ground together. The presence of the limestone or gramte'prevents in a great measure the softening of the pitch or asphalt during the grinding operation. ccording to another method the asphalt or pitch may be melted in ah iron caldron heated by a fire and the limestone-granite mixture added and stirred while hot and poured out to cool. When cold, the mixture may readily to powder without 30 difiiculty. The ground mixture is then mixed with the silicate-sugar solution and used as before to form the matrix in which the larger stones are held.

Having thus described 1 claim as new, and desire Patent, is-

1. The herein-described improvement in the art of road-making, consisting in reducing suitable available material, separating the 9 finer from the coarser material, mixing the my invention, what 5 to secure by Letters finer material with limestone or chalk. a silicate of sodaand a saccharine substance, thereby forming a substantially plastic mass, capable of setting hard, and thereafter firmly embedding the coarser material in said mass.

2. The herein-described improvement in the art of road-making, consisting in reducing suitable available material, separating the finer from the coarser material, mixing the loo I liner material with granulated asphalt or the l In testimony whereof I have signed my name like. lime or chalk, a silicate of soda and a to this specification in :he presence of two subsnccharine substance, thereh forming a su scribing witnesses. stantially plastic mass, eapubleol' settinghartl, J()ll.\ COPE BUTTER-FIELl and thereafter firmly embedding the coarser l \\'itne.-.se$: niate 'inls in said mass, substantially as de- Fmxcis J. B10.\' ELL, scribed. BBR'IRAM H. MATTHEWS. 

